Add Airflow DAGs at container image build time
Add Airflow DAGs at container image build time

Update Airflow Dockerfile so that DAGs are added to the image at build
time.

azavea/raster-foundry,aaronxsu/raster-foundry,azavea/raster-foundry,azavea/raster-foundry,azavea/raster-foundry,aaronxsu/raster-foundry,raster-foundry/raster-foundry,aaronxsu/raster-foundry,raster-foundry/raster-foundry,aaronxsu/raster-foundry,azavea/raster-foundry,raster-foundry/raster-foundry